<template>
  <div>
    <!--面包屑导航区域-->
    <el-breadcrumb>
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!--卡片视图-->
    <el-card>
      <!--添加角色按钮区域-->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>

      <!--角色列表区域-->
      <el-table
        :data="rolesList"
        border
        stripe
      >
        <el-table-column type="expand" label="权限列表">
          <template slot-scope="scope">
            <el-row :class="['bdbottom', i1 ===0  ? 'bdtop' : '', 'vcenter']" v-for="(item1, i1) in scope.row.children"
                    :key="item1.id">
              <!--渲染一级权限-->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row, item1.id)">
                  {{item1.authName}}
                </el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!--渲染二级和三级权限-->
              <el-col :span="19">
                <!--通过 for循环 嵌套渲染二级权限-->
                <el-row :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']" v-for="(item2, i2) in item1.children"
                        :key="item2.id">
                  <el-col :span="6">
                    <el-tag type="success" closable @close="removeRightById(scope.row, item2.id)">{{item2.authName}}
                    </el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag type="warning" v-for="item3 in item2.children" :key="item3.id" closable
                            @close="removeRightById(scope.row, item3.id)">{{item3.authName}}
                    </el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
            <!--<pre>
              {{scope.row}}
            </pre>-->
          </template>
        </el-table-column>
        <!--索引列-->
        <el-table-column type="index" label="#"></el-table-column>
        <el-table-column prop="roleName" label="角色名称"></el-table-column>
        <el-table-column prop="roleDesc" label="角色描述"></el-table-column>
        <el-table-column label="操作" width="300">
          <template slot-scope="scope">
            <el-button type="primary" icon="el-icon-search" size="mini">编辑</el-button>
            <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
            <el-button type="warning" icon="el-icon-setting" size="mini" @click="showSetRightDialog(scope.row)">分配权限
            </el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!--分配权限的对话框-->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close="setRightDialogClosed"
    >
      <!--内容主体区域；树形控件-->
      <el-tree
        :data="rightsList"
        :props="treeProps"
        show-checkbox node-key="id"
        default-expand-all
        :default-checked-keys="defKeys"
        ref="treeRef"
      >
      </el-tree>
      <!--底部区域-->
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'Roles',
  data () {
    return {
      // 所有角色列表的数据
      rolesList: [],
      // 控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      // 所有权限的数据
      rightsList: [],
      // 属性控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 属性控件中默认选中的节点id值数据
      defKeys: [],
      // 当前即将分配权限的角色id
      roleId: ''
    }
  },
  created () {
    this.getRolesList()
  },
  methods: {
    async getRolesList () {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败！')
      }

      this.rolesList = res.data
      // console.log(this.rolesList)
    },
    // 根据id删除对应的权限
    async removeRightById (role, rightId) {
      // 弹框提示用户是否要删除
      const confirmResult = await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.error('已取消权限删除')
      }
      // 可以执行删除权限的操作了
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      console.log(res)
      if (res.meta.status !== 200) {
        this.$message.success('权限删除失败')
      }
      this.$message.success('权限删除成功')
      // this.getRolesList()  // 页面会重新渲染，原先的展开项就又关闭了
      role.children = res.data
    },
    // 显示分配权限的对话框
    async showSetRightDialog (role) {
      // 保存值：当前即将分配权限的角色id
      this.roleId = role.id

      // 获取抽权限的数据
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取权限数据失败！')
      }

      // 把获取到的权限数据保存到 data 中
      this.rightsList = res.data
      console.log(this.rightsList)
      // 递归获取三级节点的id
      this.getLeafKeys(role, this.defKeys)
      // 展开权限框
      this.setRightDialogVisible = true
    },
    // 通过递归的形式，获取所有三级权限下的id，并绑定到 defkeys 数组中
    getLeafKeys (node, arr) {
      if (!node.children) {
        // 如果当前node节点不包含children属性，则是三级节点
        return arr.push(node.id)
      }
      node.children.forEach(item => {
        this.getLeafKeys(item, arr)
      })
    },
    // 监听分配权限对话框的关闭事件
    setRightDialogClosed () {
      // 清空数组
      this.defKeys = []
    },
    // 点击为角色分配权限
    async allotRights () {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      // console.log(keys)

      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(
        `roles/${this.roleId}/rights`,
        { rids: idStr }
      )
      console.log(res)
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败！')
      }
      this.$message.success('分配权限成功！')
      // 刷新列表
      this.getRolesList()
      // 关闭对话框界面
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
  .bdtop {
    border-top: 1px solid #eeeeee;
  }

  .bdbottom {
    border-bottom: 1px solid #eeeeee;
  }

  .vcenter {
    display: flex;
    align-items: center;
  }
</style>
